Synthesis, characterization and properties of novel polymers containing pendant photocrosslinkable chalcone moiety
โ Scribed by A.V.Rami Reddy; K. Subramanian; V. Krishnasamy; J. Ravichandran
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 655 KB
- Volume
- 32
- Category
- Article
- ISSN
- 0014-3057
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โฆ Synopsis
Acrylate and methacrylate monomers containing the photodimerizable G(, /3-unsaturated ketone moiety were prepared and polymerized in methyl ethyl ketone u&g benxoyl peroxide as initiator at 70ยฐC. The nolvmers were characterized bv UV. IR. 'H-NMR and "C-NMR snectra. The molecular weiahts fiW and -an'of the polymers were det&min&l by gel permeation chromatography. The thermal stability of the polymers was measured by thermogravimetric analysis in air and nitrogen. Glass transition temperatures of the polymers were determined by differential scanning calorimetry. The photoreactivities of the polymers were investigated as thin films and in solution.
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Acrylate and methacrylate monomers with the photodimerizable โฃ,โค-unsaturated ketone moiety, such as 4-cinnamoylphenyl, 4-(4-methoxycinnamoyl)phenyl, 4-(4-nitrocinnamoyl)phenyl, or 4-(4-chlorocinnamoyl)phenyl, were prepared and homopolymerized using benzoyl peroxide as the initiator at 70ยฐC in methyl
Two chalcone-derivative isomers, 4,4-diaminochalcone ( 4DAC ) and 3,3diaminochalcone ( 3DAC ), were synthesized and used as monomers together with tetracarboxylic dianhydrides to prepare novel photosensitive polyimides that contain a chalcone moiety in the main chain. The polyimides were characteriz